let input = `4 #
I love GPLT`
let input_arr = input.split('\n')

let arr = input_arr[0].split(' ')
let word_length = parseInt(arr[0])
let pad_char = arr[1]

let msg = input_arr[1]

if (word_length <= msg.length)
    {
        let submsg = msg.substring(msg.length - word_length,msg.length)
        console.log(submsg)
    }
else
{
   let padstr = pad_char.repeat(word_length - msg.length)
   console.log(padstr+msg)
}